Spider for chair-seats.



C. 1. TRAVERS.

SPIDER FOR CHAIR SEATS. APPLICATION man Au'cA. m1.

Patented Feb. 19, 1918.

.Zizaerziar; U/LarZ& JZraz/ens;

CHARLES J. TRAVERS, OF PORT WASHINGTON, WISCONSIN, ASSIGNOR T0 GILSON MANUFACTURINGCQ, A CORPGBATION OF 'VJ'ISCONSIN.

SPIDER 'FGR CHAIR-SEATS.

meesae.

To all whom it may concern:

Be it known that I, CHAS. J. TnAvnRs, a citizen of the United States, residing at Port l Vashington, in the county of Ozaukee and State of Wisconsin, have invented a new and useful Spider for Chair-Seats, of which the following is a specification.

This invention relates to improvements in chairs, and has special reference to what is known as the spider, the same being that portion of the chair-iron that is applied directly to the underside of theseat and therefore connects the same to and suppo'ts it upon the adjusting-screw or standar The many advantages, such as lightness, economy, strength and durability, that arise from the employment of spiders formed of sheetmetal, have long been recognized in the manufacture of chair-irons, but such have heretofore been confined to use in connection with chair-irons of the revolving and swinging styles, that is, where a spreader is included and which offered a foundation to which such sheet-metal spiders could readily be riveted. In styles of chair-irons of the swivel or revolving type and where no such convenient means as a spreader are included but simply a threaded adjusting-standard or screw employed, it has been the custom to employ the heavy, cumbersome and more expensive castiron spider.

This invention, therefore, relates to the latter type, though, of course, the invention is not to be considered as being limited in its application.

The objects of the invention, as may be readily inferred from the foregoing, is to produce a sheet-metal spider capable of being applied directly to the upper end of the usual adjusting-screw or standard, and which, notwithstanding it is constructed wholly of sheet-metal, yet is strong and durable as well as light, and capable of successfully withstanding the strain to which such devices are usually put when in use.

Other obiects and advantages of the invention will hereinafter appear, and the novel features-thereof will be particularly pointed out in the appended claims.

Referring to the drawing Figure 1 is a top plan view of a sheetmetal spider embodying my invention;

Fig. 2 is an inverted or bottom plan view Specification of Letters Patent.

Application filed August 4, 1917.

Fatented Feb. 19, 1918.

Serial No. 184,394.

Similar numeralsof reference indicate similar parts in all the figures of the drawing.

The number of spider-arms l, employed, may vary, but in the present instance, following the usual design, three are shown. Each of these arms, it will be seen, is of concave-convex form in cross-section, each being surrounded by a flange 2, horizontally disposed. The arm is generally tapered or reduced toward its outer end, which latter is flattened and slightly elevated above the general horizontal plane of the arm, as at 3, to form an attaching-end for application to the underside of the chair-seat (not shown), ordinary screws being designed to be passed upwardly through perforations 4, provided in said attaching-ends for this purpose.

The under convexed sides of the arms, at their inner ends, rest in shallow concavities 7, that conform with the transverse shape of the arms, and are formed in a saddleplate 5, between which concavities in said plate, the edge of the latter is upturned to form intermediate lips 8. As three spiderarms are employed, the concavities, of course, agree in number, and they are located equidistant apart, as shown. The saddle-plate is further provided with a central hole 6, in the present instance, to receive the upper reduced end of the adjusting-standard or screw. For the purpose of retaining the inner ends of the spider-arms and the saddle-plate in rigid relation, rivets 9, are employed to connect the bottom of each concavity with the corresponding part of the spider-arm.

Sui-mounting the inner ends of the arms when the latter are thus positioned and secured to the saddle-plate, is a disk 10, the same in this instance substantially approximating the diameter of the saddle-plate and provided with a central opening 12, alining with that in the saddle-plate and forming a practical continuation thereof. The inner ends of the arms are squared so that they meet and abut at their opposite edges and combine to form a triangular opening between the plates and in line with the holes 6 and 12 thereof, as clearly shown by dotted lines iii-Fig. 1'. Thus the arms form no obpossess all the rigidity and strength of the usual cast metal spider and at the same time is much cheaper and lighter. It will be 7 understood that the number of arms employed may be varied from that shown, in which case the number of depressions or concavities in the saddle-plate will correspond.

Vv hile I have herein shown and described the spider-arms as being riveted between the two plates, it will, of course, be understood that the rivets may be omitted and the parts welded together.

Having described my invention, what I claim is: i

1. A chair-spider, comprising a plurality of sheet-metal arms provided with outer attaching-ends and marginal flanges, a saddle Copies of this patent may be cbtained for Hence the reduced end or the usual plate on the underside and receiving and supporting the inner ends of the arms,

means connecting the arms and plateyand an overlapping plate arranged upon the flanges of the arms and secured thereto.

A: chair-spider, comprising a plurality of radiating sheet-metal arms providedjwith mar inal flanges and outer attaching-ends elevated above the plane of said arms,

saddle-plate secured to the underside'of the arms and having cavities receiving the same, and an upper disk surmounting the arms and secured to the flanges thereof, the inner ends of the arms being squared and abutting at their corners and combining to produce a space between the alining perforations formed in the saddle-plate and disk to permit of the passage of the supporting standard.

3. A. chair-spider, comprising a plurality of sheet-metal arms provided with outer attaching-ends, said arms being concavo-convex in cross-section and provided with lateral marginal flanges, a saddle-plate under said arms and provided with concavities receiving the same, rivets connecting thearms and saddle-plate, superimposed disk, rivets connecting the same and flanges of the arms, and alining perforations formed in the saddle-plate and disk.

CHARLES J. TRAVERS.

Witnesses:

' H. V. 'BoLENs, T..A. BonRNER.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

